-centile command-

[Buyadaa Oyunchimeg]

Dear Stata users,

I am wondering, is it possible to generate upper and lower 95% CI of variable V1 as new variable using -centile- command. I have tried -statsby- but no results (all values are missing for median, upper and lower variables).

Codes:

bys ID: centile V1

 statsby median=r(c_50) upper=r(ub_50) lower=r(lb_50), clear by( ID): centile V1, 

Many thanks

[Scott Merryman]

Your returned values are incorrect.

. sysuse auto,clear
(1978 Automobile Data)

.  statsby median=r(c_1) upper=r(ub_1) lower=r(lb_1), clear by(fore): centile mpg
(running centile on estimation sample)

      command:  centile mpg
       median:  r(c_1)
        upper:  r(ub_1)
        lower:  r(lb_1)
           by:  foreign

Statsby groups
----+--- 1 ---+--- 2 ---+--- 3 ---+--- 4 ---+--- 5 
..

. l

     +--------------------------------------+
     |  foreign   median      upper   lower |
     |--------------------------------------|
  1. | Domestic       19   20.60141      18 |
  2. |  Foreign     24.5   26.13934      21 |
     +--------------------------------------+

[Buyadaa Oyunchimeg]

It works! Thank you so much for your help .